题干
_________ is the sun? It's red.
A：what colour
B：What
C：What colour
答案(点此获取答案解析）
C
_________ is the sun? It's red.
A：what colour
B：What
C：What colour
两种方案的移动通。费用y(元)与通话时间x(元)之间的关系，则以下说法错误的是( )